The microgrid system is composed of diesel power generation system , photovoltaic system, energy storage system, microgrid controller, and microgrid energy management system.
Overall design of the system
The project scheme uses photovoltaic system, energy storage system and diesel engine power generation system to supply power in a complementary way, complementing each other to ensure the stable, safe and reliable supply of power for the load. The overall configuration of the project is as follows:
1) Photovoltaic system: refers to all electrical equipment from solar cell modules to AC combiner box, including solar cell modules, photovoltaic inverters, AC combiner boxes, AC and DC cables, etc.;
2) Energy storage system: refers to all electrical equipment from the energy storage battery system to the energy storage bidirectional converter PCS, including bidirectional converter, battery rack, battery management system, energy storage energy management system, combiner cabinet, fire protection, temperature control, protection system, etc.;
3) Diesel generator system: the diesel generator that the user has built.
4) Microgrid energy management system: including data acquisition device, server, software, etc.
5) Microgrid controller: In order to realize the collaborative control of each source, grid, load and storage unit in the microgrid, the project is equipped with a microgrid controller. The photovoltaic energy storage power station outputs power according to the requirements of the dynamic balance of microgrid power, and the grid-based energy storage power station provides dispatching power, frequency and voltage support, etc.
The photovoltaic and energy storage systems of the microgrid system of this project adopt AC bus connection mode: the connection between the devices is clear, the power is decoupled from each other, it is easy to control, and the output characteristics are good.
The primary topology diagram and communication topology diagram of the microgrid system are shown below.